linux-kernel - mount -o loop with truncated dosdisk.img uses 100% cpu and can't be killed

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Date:	Thu, 12 Jul 2012 16:28:28 +0200
From:	Stevie Trujillo <stevie.trujillo@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	linux-kernel@...r.kernel.org
Subject: mount -o loop with truncated dosdisk.img uses 100% cpu and can't be
 killed

Hello,

I was trying to create a bootdisk to update my BIOS, and accidentially
made a 512byte image with only the FreeDOS header in it.

( Linux 3.4.4 )
# mount -o loop dosdisk.img /tmp
^C^C^C
It uses 100% CPU and doesn't listen to me when I do ^C, kill -9 etc. I
think this means it's stuck in the kernel?

Here is the base64 encoded image (use base64 -d command to unpack it).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=

--
Stevie Trujillo
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